Post Utme Physics Past Questions and Answers

Question 661:

Converging lenses with focal lengths \(4 cm , 40 cm\) and \(4 m\) are available for use. Which of them will you use as a magnifying glass

A. \(4 cm\)
B. \(40 cm\)
C. \(4 m\)
D. None of the above

Question 662:

A piece of aluminium of mass \(0.5 kg\) at a temperature of \(100^{\circ} C\) is placed in water of mass \(0.4 kg\) at a temperature of \(10^{\circ} C\). If the final temperature of the mixture is \(40^{\circ} C\). Find the specific heat capacity of aluminium if that of water is \(4200 J / Kg /{ }^{*} C\)

A. \(960 HKg /{ }^{*} C\)
B. \(908 J / Kg /{ }^{\circ} C\)
C. \(1860 J / Kg /{ }^{\circ} C\)
D. \(1680 J / Kg /{ }^{*} C\)

Question 663:

Hardness of X-rays is a measure of its ____________

A. Intensity
B. Density
C. Penetration powe
D. Picture it produces

Question 664:

The half life of a radioactive substance is 2 seconds.
Calculate the decay constant

A. \(0.035 s\)
B. 0.347 s
C. 0.151 s
D. \(0.576 s\)

Question 665:

A body moves with a constant speed but has an acceleration. This is possible if it ____________

A. Moves in a straight line
B. Moves in a circle
C. Is oscillating
D. Is in equilibrium